Johan,
  
Quoting the CP prog guide from the DEVCON 9 Warp toolkit:
  
... in dialog coordinates, which are based on the size of the system font.
A horizontal unit is one-fourth the average width of the characters in the
system font; a vertical unit is one-eighth the average height of the char-
acters in the system font.
  
Hope this helps.
  
Peyton

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